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   REPLY: <868ed1475b.DaveMeUK@BeagleBoard-xM> 8be1eb15   
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   On 26/03/2024 19:16, David Higton wrote:   
   > In message    
   >            The Natural Philosopher  wrote:   
   >   
   >> On 26/03/2024 18:16, Ahem A Rivet's Shot wrote:   
   >>> On Tue, 26 Mar 2024 17:33:50 +0000 Jim H  wrote:   
   >>>   
   >>>> Assuming the "oil" you're talking about is kerosene/heating fuel, the   
   >>>> speed of sound is 1330 m/sec so 0.5cm takes 3.76 micro-sec.   
   >>>   
   >>> 	I would have thought it's measuring the distance to the surface of   
   >>> the oil from above the oil so it would be the speed of sound in air that   
   >>> matters 300m/s.   
   >>>   
   >> Correct, Mrs Shot. Anyway it's died within 30 minutes of going back on   
   >> 'short echo'... So its definitely sensitive to that in some way.   
   >>   
   >> I'll add more debug code tomorrow   
   >   
   > Are you sure the sensor isn't malfunctioning as a result of being in   
   > oil vapour?   
   >   
   Since it is operating on the desk in front of me, fairly sure :-)   
      
   I haven't let it anywhere near the oil tank yet. The plan is to have it   
   installed by the fall. ready for next winter.   
   So it is being hammered to check for problems *before* it gets to a cold   
   wet inaccessible oil tank.   
      
   > David   
      
   --   
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   gets full Marx.   
      
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